The decreased maximum pupil contraction to blue light in the operated eye after surgery could be the result of intraoperative damage to iris sphincter or inflammation. Another reason for the immediate difference in baseline pupil size at 1 day is just as likely to be due to rebound effects of the mydriatic agents used during surgery, which is a well-known effect. Lens thickness may also contribute to the decreased pupil size, as intraocular lens intraocular lens (IOL) is much thinner, thus protruding the iris less than the larger cataractous eye lens. This may be caused by different levels of inflammation, as postoperative inflammation has been shown to vary similarly. Yet, other studies have reported decreased pupil size up to 12 months after surgery (Komatsu et al. The reported transient miotic effect of cataract surgery on short term is consistent with one previous study (Hayashi & Hayashi 2004). The PIPR 1030s before the surgical intervention was 0.14 (☐.06) in the surgery eye and 0.13 (☐.08) in the fellow eye (p = 0.87), and there was no significant difference following the surgery. The PIPR 010s in the surgery eye was 0.30 (☐.05) and in the fellow eye 0.31 (☐.05), and the pupils showed reduced PIPR 010s in the eye having undergone surgery at each time-point, but the effect was minor. Likewise, the maximum contraction was reduced minutely at 1 day (p = 0.02) and 3 weeks (p = 0.01), but not at the 3-month follow-up (p = 0.50). The baseline pupil diameter was transiently affected by surgery, as the pupil was 0.37 mm (p = 0.003) smaller on the surgery eye 1 day after surgery but not at any other time-point hereafter (Table 1). The effect of surgery was investigated by comparing the intereye differences (fellow eye – surgery eye) before and after surgery. Three patients were not examined at the 3-month follow-up due to the cataract surgery of the fellow eye. Cataract surgery by phacoemulsification was performed using local anaesthesia. The outcomes were baseline pupil diameter, maximum pupil contraction and post-illumination sustained pupil responses from 1 to 10 seconds (PIPR 010s) and 10 to 30 seconds (PIPR 1030s) after termination of the light. ![]() The non-operated eye was illuminated, and the pupil response was measured in both eyes. As many patients with retinal diseases undergo cataract surgery, we wanted to investigate whether there was a mechanical effect of unilateral cataract surgery on the pupillary light response.īilateral pupil responses to blue light (463 nm, 2 loglux) were recorded in 11 subjects before, 1 day, 3 weeks and 3 months after unilateral cataract surgery using a binocular chromatic pupillometer (DP-2000, NeurOptics). Recent research findings suggest chromatic pupillometry as a novel tool to differentiate between outer and inner retinal diseases.
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